T-MobileConfirmsSupportForiOS8'sWi-FiCallingFeatureOniPhone

Not long after Apple subtly announced that Wi-Fi calling would launch as part of iOS 8, T-Mobile updated its corporate blog to confirm that it'll indeed be supporting Wi-Fi calling on its network.
The news from Apple originally came in the form of its usual "under-the-radar" iOS update slide, in which Cupertino listed a bunch of features added in iOS 8 which weren't offered dedicated stage time. Among these more minor changes were per app battery information and a time-lapse mode for the Camera app.
Though Apple didn't elaborate on Wi-Fi calling during its keynote, T-Mobile -- the United States' so-called "uncarrier" -- confirmed its support for the feature in a corporate blog post. There, chief marketing officer Mike Sievert said:

One of the best things about T-Mobile Wi-Fi Calling is that it’s so simple to use. You don’t need to activate anything or download a special app. Just connect to any available Wi-Fi network, check that Wi-Fi Calling is turned on on your capable smartphone, and make a call (or send a text, email, etc.) as you normally would. That’s it.